3D Printing Construction of Carboxylated Cellulose Nanofiber-Based Radiative Cooling Composite Materials
Daytime radiative cooling is a passive cooling technology that modulates the optical properties of a material to reflect sunlight and enhance its thermal radiation in the atmospheric transparent window,thereby achieving cooling without energy input.Porous materials are among the most promising candidates for achieving daytime radiative cooling.This study proposes a directink-write 3D printing method to fabricate carboxylated cellulose nanofiber(CNF)/hexagonal boron nitride(h-BNNS)composite porous materials with excellent radiative cooling performance.CNF,as a green resource derived from natural materials,exhibits high absorption peaks in the atmospheric transparent window band,making it an ideal material for radiative cooling.The abundant C-O and other functional groups on the surface of CNF facilitate the formation of a three-dimensional network structure when compounded with other components.The introduction of highly sunlight-refractive h-BNNS inorganic nanoparticles enhances solar light scattering(96％)and atmospheric window emissivity(94％).Under direct sunlight conditions,the cellulose nanofiber-based composites can achieve a maximum cooling temperature of 12 ℃ and an average cooling power of 90.1 W·m-2.
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